Repeater circuit



J. F. TOOMEY.

REPEATER CIRCUIT.

APPLICATION FILED OCT. 16, 1911.

1,407,604. Patented Feb. 21, 1922.

2 SHEETS-SHEET I.

INVENTOR.

W ATTORNEY J. F. TOOMEY.

REPEAT ER CIRCUIT, APPLlCATION FILED OCT. 16. 1917.

1,407,604, Patented Feb. 21, 1922.

2 SHEETS-SHEET 2- INV R. ;!1? Tourney o g, A TTORNEY UNITED STATES;

OFFICE.

JOHN T. TO0MEY,,0F NEW YOR N. Y. fassIsi'IonToAMEnIcm TELEPHONE AND TELEGRAPH COMPANY, A CORPORATION or NEW YORK.

fnEPnATnit omoorT.

swee en met -seam. Patented Feb. 21, 1922.

' Application filedvOctobei 1 6, 19 17.;seria1 No. 196,896.

T 0 all whom it may concern: 7

Be it known that 1, JOHN F. TOOMEY,'1G5

siding at 111 1V. 84th Street, New York city, in the county of New York'and State of New York, have invented certain Improvements in Repeater Circuits,,of which the'ttol- I lowing is a specification. a

This invention relates to telephone repeaters and more particularly torepeater 'or ganizations employing repeater elements of the so-called mechanical type.

One of the objects of tlie invention has reference to the provision of means where bythe repeater may be connected'to, and

disconnectedfrom, the talking circuit at the will of'theoperator. I

Another object ofthe invention has ret erence to the provision of means whereby the operator may render the repeater operative or inoperative at will.

Another object of the invention is the pro vision of suitable equipment whereby an operator may control the amplification "of the repeater.

A still further object of the invention the provision of ringing equipment snitable for cooperation wlth a repeater, and more particularly the provision of means whereby in response to a ringing signal the repeater is rendered inoperative so as not to be at fected by ringing current.

These objects, together wit-h other obj ects which will more fully appear in connection with the detailed description of the invenf tion, are attained by arranging a repeater in connection with a cord circuit in such a manner that the operator by depressing a controlling key may disconnect'the two ends of the cord circuit and connect a repeater organization therein, the operation of the key at the same time actuating means to connect a source of operatingcurrent to the repeater elements. The controlling key is also so arranged as to be ad ustable to various positions, in certain of which it may control an adjusting mechanism to vary the setting of the regulating rheostats 1n the output circuits of the repeater elements, thereby controlling the amplification of the repeater.

The means whereby the repeater is interpo-* lated in the cord circuit is so arranged that if rlnglng current 1s received from the line,

thereby actuating suitable ringing respon sive mechanism, said means will hold the repeater connected to the cord circuit, butthe repeater will berendered inoperative and unresponsive to' ringing current.

:The invention will bemore fully understood froin the following description when read in connection with the appended drawing, Figures land 2 of which when placed side by side constitute a circuit, diagram of a preferred embodiment of the invention.

Referring to the drawing, two lines L, and L, are shown terminating in twin jacks J, and J respectitvely. A cord circuit repeater arrangement is, also shown. terminating in twin'plugsP and P adapted to be inserted in jacksJ and J Associated. with lines L and L are artificial balancinglines two ends of the cord circuit .may be disconnected and'the repeater apparatus interpo lated in the circuit. 4 For this purpose a controlling key arrangement is provided, consisting of contacts K,-, K K and K,, said contacts being under the control of a movable member capable of'assuming .a plurality of positions. In the first position the contacts" K" are closed. In the second position contacts K, and K are closed. In position threecontacts K K and K are closed, while in position four all of the contacts are closed. Upon operating contacts K relays 4 and 5,are,operated thereby disconnecting from the plugs that portion of the cord circuit comprising splitting key 3 and listening key 6, and connecting the repeater'apparatus over the contacts of said relays to plugs P and P The operation of contacts K, also controls the energization of a relay 7, whereby a source of current is supplied to the repeater elements. The repeater organization comprises two repeater elements R, and R which are illustrated as of the so-called'mechanical type of repeater element, although it will be understood that any-other well-known form of re eater element maybe used if desired. Repeater ele+ ment R, comprisesth ree windings 8, 9 and 10, as well as a variable resistance transmitting ",device 111. windings-9 and "10am in circuit with the source ofcurre-nt controlled by relay 7, and are differentially woundvvith respect to each other, the windingQbeifng also arranged in parallel with respect to the variable resistance ll. Winding 8 is con nected through induction- 12 wigth fi e input bridge 13 of the repeater. Similarly, repeater element B comprises windings. 14, 15 and 16 as vyell as variable resistance transmitting element 17, said windings 14, 15 and 16 corresponding to and functioning inthe samemanner as windings ;8,9 and 10,

respectively, 'oflrepeater element 1%,. A re- ,shunt across the output circuit 21, andthe latter arranged to be connected in series with said circuit. Each resistance element, 22 d ai nmv ded w h a: p ra i rof con.- necting points numbered 1, 2,3, etc, said connecting points being-controlled over the contacts of relays 24,25 and26. to-vari a,bly determine the amount'of' resistance connected in shunt and in series with outputcircuit 2 n a imi armann in th utput ciru 27 of e te el m nt B; an utp t regulating a n emen 7 ompr ing si t: ances28 and 29, is provided, resistance 28 being arranged to be-connected in shunt of output circuit 27 and resistance 29 being arranged to be connected in series therewith. Said resistances 28 and 29, like resistances 22 and23, areprovided with a; plurality of connecting points controlled over the contacts of 1' ay 0,-.3. d- 2m ably d t rm ne the-amount otresistance in shunt and-in series with the. output circuit 27. Relays 24 andBO arecontrolled by key contacts K,.

Similarly, relays. 25 and 3l arecontrollefd by contacts K and. relays26 and 32- are controlled byrcontacts K Whenthe control,- ling key member is moved to its firstposition so that contacts K only are operated, none of the output regulation controlling reys is ua an c ns quen ly the 2 11 resistancesofelements 28 and 29 are conected m i wit Outnst'eir ui s 2 c re pe ive y h le ly he temperanely W re i ta c s 2 the :Port s .Q-f P0:

however, the key controlling member is moved to its second position, thereby closingcontactK in addition to contacts K relays 24 and 30 are actuated to complete the series and shunt connections to the second point of eachpotentiometer element, thereby ;decreasingfitheseries resistance and increasing theshunt resistance. A greater :degree of amplification therefore results. In a similar manner, by the actuation of contacts K relays 25 and 31 are actuated to com lete the Connection from thethird-points 0 itlic potentiometer elements, thereby'still further decreasing the shunt resistance. Finally, if contacts K are actuated, relays 26 and 32 willbe operated to complete a direct connection gfor the output circuits 21 and 27with no resistance inseries therewith and withthe shunt elements of the potentiometer disconnected. With this arrangement of the circuits the repeater elements will be working at'their' greatest efiiciencyand the'highest degree of amplification will be obtained.

Bridged across the conductors "leading from the upper halves of plugs P and P are relays 33 and 34 responsive to ringing current; These'relays jointly control a normally energized slow acting relay 41 which in turn controls'the circuit of a relay 66, whereby a lamp 35 may be caused-to glow and a relay 36 be energized for a purpose hereinafter stated. Therelays 33 and 34 are unresponsive to voice currents but will respond .to ringingcurrents or to intermittent currents of similar amplitude. The relay 41being slow acting, however,'does not respond to the intermittent actuation of relays 33 or 34 by intermittent currents, so that a false signal of the lamp 35 does not result. Upon theactuation of either of these relays by ringing current, a signal lamp 35 is caused to glow and-a relay 36 is actuated to open the circuit of relay 2O whilemaintaining relays 4 and 5iener'gized. This results in opening the secondary circuits of induction coils 12 and 18, andin short-circuit-ing the input windings Sand 14 of the repeater elements R, and B so'that the repeater is not actuated by'ringing current. The same re- SuIt maybe obtained by throwing ringing key 101 2, as saidikeys are provided with cont-acts "for energizing the relay 3 6. The listeningkeyfi isso arranged'that when the operator --thr0ws this :key in response to a ringing signal such asjust described, the

relays 14 and 5, which control the interpolation of-the repeater in the cord circuit, are

restored tQrnormaLandthe repeater discon- ,Pfil'fltllS in, mind, the invcntion nay be tally understood from adescription of; the opera tion. Assuming thata call has COIIlQylIkQYfiI; line L the operator in response; tQSiiidqQfllL will insert thetwin plug P, in twin jack, J :thereby completing a circuit overthe; sleeve contacts of the upper half of the plug-and jack for relay 37. Upon theactuation ofi-relay 37 a circuit. is completed; from. ground; over the lowerfrontcontact of'saildrelayyto point 38 and thence to point. 39, from whichpoint the circuit proceeds overthenormal contact of ringing responsiye. relay '33," oven spons ive relay 34 and throughthe; winding of relay 41; to battery.- The energization Oi?" relay 41. t this, time produces no. efiect'.

Having. inserted the plugyinl the answer in jack, the operator throw he nstcninmkey; 6 to, communicate over th el il g i ll Having. ascertained the desired connection, which it will be'assumed is to be completed."

over line L,,, the operator restorestlie listen ing key and inserts theplug-P; intwin jack,

J thereby completing: a. circuit: ovcrgthe-- sleeve contacts of theupper halves of the:

plug andjack for, relay42. The operator now. throws ringing key 2, and rings. over the line L If it is desiredsto connect the repeater 1 in circuit. the, operator actuates the controlling key to oneof itsfour positions, for instance, to its second. position. This results in closing contact sets K and The closing of contact43 of: contact setlK completes a; circuit from ground over: the:

"lower front contact of relay 37 topoi-nt 3.8

andover contact 43, and through'the w'inding of relay 7 tobattery. Relay 7, upon being energized, COIIIIBCtS'a battery 44 .to the repeater elements R and R thereby rendering them operative. In case. the;

ringing key has been restoredto normal prior, to the actuation of the controlling. key,

a circuit is completed over'contact45 of. contact set K,, as follows: From ground. over the lower front contact of relay :37- to point 38 and thencev through point '39 .to'

point 46, from whence the circuit continues over contact 47 of splitting key, 3,, contact 48 of said key, contact 49 of listening keyv 16, upper frontcontact of'relay 42. oyjcr; cone ductor 59, upper front, contact ofcrelay 371' to point 51, and thenceoverc0ntact-45, condoctor 52, winding of relay 20, no'rmalcon; tactof relay 36, to point 53, from which: point the circuit continues in parallel, through windings of relays '4 and 5-to bat-- tery; The energization of relayj 20 ,results.

in opening the short-circuits existing around;

windings 8 and'14 of-repeaterwelements, R; and; R and in the completion oft-attiredconnectionoyer thefront contacts of. said relay. between said windings 8 and 14 and. thecorresponding secondaries of induction coils 12 and 18, which are associated with; the input bridges 13 and 19 of the repeater circuit: The energization of relays 4 and=5vresults in the. disconnection of the p rtion, of the cord. circuit including the plitting-key, 3 and listening key 6 from the; plugs P and P at the Sametime con-- nectmgsaid: plugs over the front contacts of relays! and 5 tonthe repeater apparatus. Theactuaticn 'of-the controllin key to its second position. results in closing, contact ias. Welles contact ,setK thereby coinpletinga c rcuit ,irom ground-over th lower front contact ofr-relay'37 and over. path already; traced} to point--51, from which, .pointlthe circuit proceeds over. contact. K and; throu hthewindings off relays 24 and 30 to battery The actuation, of said relays resultsinthe; connectioneof the portion of 1output;rcglllatingyelement 22 between points 2. and 4 infjshnnt oi output circuit 21' and t e, connection. olfithe portion f output regiilatingclement 23: between oints 2 and 4 in series. withfsaid circuit. utput "regulatingelements 28 and 29 are, similarly ad- "usted! with; respect to outputcircuit 27.

ines L anrLL are now connected through therepeater, Whichis adjusted to its second degreeof amplification, and the conversation between the; parties connected. over linesL and L may proceed.

The operations previously described were based on the; assumption that, the ringing key: 2 was restored prior tothe actuation ofthe: repeater controlling key. In case, however, the repeater controlling key had. been operated prior to the; restoration of theringing key, the circuit preyiously traced through, relay 20and relays 4 and 5 inparagllel would not have been completed,

completed. instead from ground over the lower' front contact of relay 87 and over the; path preyionsly tracedto point 51 and thence over-contact 45 and over conductor 54 to point: 55, thenceover conductor 56 to point 57, over contact 58 of the ringing key 2- topointv59, over conductor 60 to p intfil, and thence-over conductor .62 and through 1 the, winding of relay 36 to battery; is energized over said circuit, thereby: holding; open: the circuit already traced through relay 20 in series with relays 4 and fh inparallel. Acircuit isconiplctcd, l1owever',1over the frontcontact of relay 36.from ground to'poin't 53,, and thenc in P rallel through the windings of relays .4 and5 to battery. Relays 4 and 5 are thereby -actuated to Connect the plugs P, and 11 totlle repeater, but relay 20, is not energizedandrconseqnently the input windings a.I (i ,-,14 of;the repeater elements R and R such currents, but is'so designed as to "be are short-circuited, jllpon restoring the ringing key 2 to normal the rela'y'36 will" be tie-energized, thereby co'mpletingthe cir cuit previously traced throughrelay 20 in series with relays t-and 5, so that relays '4 and (rare maintained energizec'l and relay about-the'input windings of the repeater; elements and to complete the connections between said windings and the induction coils 12 and '18. The'connectio'n is .jnow completed between the lines JL, and "L, through the repeater, as already; described, and the conversation may proceed.

If during the connection between lines L and L ringing currentshould be transmit ted over one ofthe lines, say L mule re-j peater station, the ringing relay 3&bridged across the cord circuit wouldbe energized; This ringing relay isof high impedance" to telephone currents and is not energized by readily responsive to the'rin'ging currents which are of higher voltage and lower frequency. Upon being energized, "said relay" 34: at its contact'opens thecircuitpreviously traced for slow releasing relay 41,-which thereupon is ole-energized, closingat its back contact a circuit from ground,lower"front contact'of relay 37, points 38, 39, 46, 63,64

and 65, and thence over the back contac'tof relay 41 and through the winding of-relay 66 to battery.-- Relay 66 upon being energized, at its lower front contactcloses a cir cuit from ground,front contact of relay 37, points 38, 39, i6 and 63, thence overthe front contact of relay 66 and through the winding of relay 67 to battery. Belay 67 uponbeingenergized, at its left-hand front cont-act closes a locking circuit from-batterythrough' the winding and over the front left-hand contact of said relay 67 topoint 68' and thence over contact 69 of listening key'6,- throughpointsdi', 63, 4:6, 39, 38 and over the front contact of relay '37 to ground," Relay 67 at its right-hand front contact completes a circuit for the signal lamp 35, thereby inclieating to the operator that a call has comein from one or the other of the lines'intercon-' nected through the repeater. Returning again to relay '66, said relay at'its'upper front contact closes a circuit for relay 36 as follows :-from battery through the winding of relay 36, over conductor 62, point 6l,con"- ductor 60 to point 59 and thence over upper front contact of relay 66 to point =57 over conductor 56, through point 55, over conductor 54:, contact 45', point 51, upper front con'-" tact of relay 37, conductor 50, upper-frontcontact of relay 42, contact 49 0f listening key 6, contact 48 of splitting key3, contact 17 of said key, points a6, 39, 38, and over the 1 front contact of relay 37 to ground. Relay 36 upon being energized, at its front contact" closes a locking circuit'forrelays 4; 5

iaovgeor and'opens the circuit of relay 2O in the manner already' described; Relay 20 upon being de-energized disconnects the input windings 1 of the repeater elements from the input bridges of the repeater circuit and 's hort-c'ir- 70 'cuits said windings as already described. 20 s operated to open-the sho'rt' circuiis The operator upon'observing that-the signal lampfl 35 is glowingwill now throw the;

i'listening -key '6, thereby opening at-cont'act 49 of said key the circuit just traced through thewindingofrelay36', which circuit it will be r'ememb'ered passed through the contact "4.9 01": listening key- Relay 36i's thereby de-energized, and again connects the wind- "-ings of relays 4 and 5 to the winding of re '80 20- in series with 'relays i' and 5m parallel passed-through contact 49 ofthe listening:

tion of therelays 4 and5 results in interco'n j" nectiorrof the plugs'P and P through that portion 0f the cord circuit including the splitting key 3 and tlielistening key 6, so

that the operator is now enabled to listen in and respond to the signal coming in overthe line L The operation of the listening key also opened contact 69 thereof over which the locking circuit'of relay 67 hadbeen'previously traced. Assuming that the ringing I signal has ceased so that thecircuit of relay 4:1 'is again completed over theback contact pf ringing responsive relay 34, the circuit of relay 66 will now be opened at the lower con-v tact ofrelay i1, so that relay 66 is de-energizedf Consequently both the initialenen' "gizing circuit and the locking circuit of "re lay-67' are opened'and said relay isde-energized restoring the signal lamp 35 to normal;

r The, operator upon listeningin by1neans105 of thelisteningkey6, and having ascert-aine'd that the call came from over the line L may, if desired,:throw the splitting key 3 to -the,left, thereby idisc onecting line L from V the cord circuit, and permitting the operator '110' to converse with the party on line L inde-"' pende ntl-y of the party on the line Supl'pose, now,with the listening key 6 thrown and the splitting key 3 thrown to the left,

ringing current should be transmitted over the line L to'the repeater station, thereby actuating the-ringing responsive relay 33.

The actuation of said relay would open-the circuit previously traced through the relay 41, which relay upon being de-energized would I20 close the circuit of relay 66, as a1ready'described. Relay'66 in turn would'close the initial-cnergizing circuit of relay 67, which at its front right-hand contact would complete a circuit of the signal lamp 35, which lamp would accordingly gl'ow during-the continuance of'theringing signal; The locking cir- 'cuit previously traced forthe relay 67 is now open at contact 69 of the listening key, andit is ther fore n cessary to provide eue her 13.0

. ,tor 70, contact 71 oi splitting key 3,. points 46,39,38 and over lower front contact of relay 37 to ground. The relay 67 will therefore be locked up so that lamp 35 will continue to glow until it attracts the attention of the operator. The. operator upon observing that the lamp 35 is glowing'will know that the callcame in from line L,, since't'he operator is already in communication with line L Accordingly the splitting key 3 may be restored to normal or thrown-to the right. In either case contact 71 is opened, thereby breaking the locking. circuit ofthe relay 67 and restoring the ringing: signal to normal.

hen it is desired to take down the con nection between the lines L and L the plugs l? and P, may be withdrawn, whereupon relays 37 and 42 will be de-energized. The de-energization of these relays breaks the circuit already traced for relay 41. Furthermore, if the repeater had been connected in circuit, the circuit for relays 4., 5 and 20, which it will be remembered passed over the contacts of relays 37 and 42, will now be open at the contacts of said relays 37 and 42 so that relays 5 and 20 are deenergized, thereby disconnecting the repeater from the cord circuit. The circuit of relay 7 also passes over the lower front contacts of relays 37 and 42, and relays 7 is therefore de-energized, disconnecting battery 44 from the repeater elements R and R Likewise the circuit of output regulating relays 24: and 30 passes over the contacts of relays 37 and 42, and consequently relays 24 and 30 are restored to normal. The apparatus is now in condition for setting up another conection.

By means of the organization disclosed the repeater will be under the full control of the operator, and it may be connected or disconnected, or its adjustment may be varied as circumstances may require. While the invention has been disclosed as embodied in what is considered its most desirable form, it will be understood that the principle thereof may be embodied in many widely different organizations without departing from the spirit of the invention.

What is claimed is:

1. A repeater circuit including a repeater element comprising a variable resistance element and a magnetic means for controlling the same, a source of energy for said variable resistance element, relay means to control the connection and disconnection of said source with respect to said element at will, and a key for controlling said relay means.

2. A repeater circuit including a repeater element, means to ener ize said repeater ele- Arepeater circuit including a repeater element, aregulating arrangement for controlling theamplilication of the repeater element,- a-plurality of relays for controlling the adjustment of said regulating arrangement, and means for variably operating said relays. .1 4 v V 4. A repeater circuit including a. repeater element, a regulatingarrangement for controllingthe amplification of the repeater eleinent,.-aplu-rality of connections for said regulating arrangement, relays for controlling saidconnections and 'manually controlled means for variably operating said relays. i 3

5. A repeater circuit including a repeater element, a plurality of relays, means controlled by said relays for determining the amplification of said repeater element, and means for variably operating said relays.

6. A repeater circuit including a repeater element having an input and an output circuit, a net-work in the output circuit including series and shunt impedance elements, multiple connections whereby the series and shunt impedance of said net-work may be varied, relays for controlling said multiple connections, and means for variably operating said relays.

7. A repeater circuit including a repeater element, a regulating arrangement for controlling the amplification of said repeater element, a plurality of connections for said regulating arrangement, a plurality of relays for controlling said connections, a repeater controlling key having a plurality of positions, and means whose operation depends upon said key for variably energizing said relays.

8. A repeater circuit including a repeater element, a ringing responsive relay in said repeater circuit, a relay controlled by said ringing responsive relay, and means controlled by the latter relay for rendering said repeater element inoperative.

9. A repeater circuit including a repeater element, apparatus associated with said repeater circuit and unresponsive to telephonic currents or intermittent signaling currents, but responsive to continuous signaling currents, and means controlled by said apparatus for rendering said repeater element ringing current transmitted over m-linecom neeted to said repeater, a listening key associated with said repeater wnd eans' res onsive to' the actuation of saidv listening: key

7 for restoring said signaling? apparatusto normal.

12. In a signaling system, a plurality-of transmission lines,- a cord circuit" repeater for interconnecting: said lines; a liste'nin key and a splitting-l ke associated withsa" repeater whereby an operator may commnnicate With one line connected tow Elie" repeater and. disconnect a second iline connected therewith, signaling; apparatus: associated with said repeater and responsiv to sPiitfihg k y, said" signaling apparatl'i'siis responsive to signaling current renders transmitted over said "last mentioned line";

13'; I-n'a s'ignaling system,av plurajlity of trams'mi'ss'i'on lines,- a i epeater for interconnectm'g: said lines including mechanical .re-

pewter eiementsginput icircuits for said re-" pawn-elements, and 'means whereby when ringing current is transmitted over a line to which: said. repeater is connected, said 1' v eatertelements Will be short-circuited' and said input circuits opened. I

I ns' testimony :whereof; I- have signed wmy name to'thisspecification this ninth. day

ofioemb iam JOHN F. TOOMEY. 

